I just came across the Swiss group of university students, engineers and scientists from Switzerland, who want to design and build a kiteboat using a Foilkite going 80Knots breaking the world speed record. https://sp80.ch/
Now besides the problem with traction, platform aerodynamics and cavitation, projects like this usually have to face, lets assume they work out a platform which can go 80 knots....
What will a foil kite do in 80 knots boatspeed (maybe 100knots apparent) ? Maybe some Paragliders, Race Foil kiters and kite designers among us could help out on this discussion.
I wonder what a foilkite would behave like in those high and low pressures acting on the wings surfaces and also from the inside.
One should get quite some canopy deformation, at least on the wings upper surface where positive pressure from the inside and negative pressure on the outside will not cancel out but add up.
Will light nylon ripstop still work? Maybe we get a North sails 3DL kite from composite laminate in the end or even a composite wing with very few flying lines.
What will be about drag from the flying lines and bridles (pipes/round cylinder has a horrible resistance coefficent and there will be quite some loads on the bridle so they will be quite thick)
Where in kitefoiling is the lift to drag ratio a problem? On the foil or on the kite? Which prevents you from going faster? Of course besides having to go on a up and down course through maneuvers which brings some compromises.
I have no Idea with those kinds of speeds maybe if you size a foilkite up the loads/pressures is actually not a problem, hard to say without experience.
Are there people who went 100km/h and more on a Buggy/Snowkite on Ice?
Some brainfood: